<!DOCTYPE html>
<html>
<head lang="en">
    <meta charset="UTF-8">
    <title>task23</title>
    <link rel="stylesheet" href="style.css" type="text/css">
</head>
<body>
  <section>
    <div id="root">
        super
        <div class="child_1_1">
            car
            <div class="child2">
                Apple
                <div class="child3">
                    Pear
                </div>
                <div class="child3">
                    Pig
                </div>
                <div class="child3">
                    Cola
                </div>
                <div class="child3">
                    Soccer
                </div>
            </div>
            <div class="child2">
                Phone
            </div>
            <div class="child2">
                <div class="child3">
                    Book
                </div>
                <div class="child3">
                    School
                </div>
            </div>
        </div>
        <div class="child_1_2">
            Note
            <div class="child2">
                Human
                <div class="child3">
                    Code
                </div>
                <div class="child3">
                    Operate
                </div>
                <div class="child3">
                    Man
                </div>
            </div>
            <div class="child2">
                Program
                <div class="child3">
                    Bement
                    <div class="child4">
                        Cat
                    </div>
                </div>
                <div class="child3">
                    Glass
                </div>
            </div>
        </div>
        <div class="child_1_3">
            Fish
        </div>
    </div>
  </section>
    </br>


    <input type="button" value="深度遍历">
    <input type="button" value="广度遍历">
    <input type="text" >
    <input type="button" value="深度遍历搜索">
    <input type="button" value="广度遍历搜索">

</body>
<script src="task.js"></script>
</html>